html, body {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* ================================================================= */
.top{
    z-index: 99999999;
    position: absolute;
    top: 0;
    left: 0;
    height: 50px;
    line-height:50px;
    width: 100%;
    background: #FFFFFF;
}

.signature-title {
    height: 50px;
    line-height: 50px;
    display: inline-block;
    width: 90%;
    margin-left: 10px;
    text-align: left;
    font-size: 20px;
    font-weight: bold;
    color: #6aa8e7;
}

.clear_canvas{
    position: absolute;
    right: 335px;
    top: 0;
    font-size: 18px;
    background: #FF0000;
    color: #fff;
    padding: 0 20px;
    border-radius: 4px;
    height: 35px;
    line-height: 35px;
    margin-top: 7px;
}

.undo_canvas {
    position: absolute;
    right: 240px;
    top: 0;
    font-size: 18px;
    background: #ff7300;
    color: #fff;
    padding: 0 20px;
    border-radius: 4px;
    height: 35px;
    line-height: 35px;
    margin-top: 7px;
}

.redo_canvas {
    position: absolute;
    right: 145px;
    top: 0;
    font-size: 18px;
    background: #00aeff;
    color: #fff;
    padding: 0 20px;
    border-radius: 4px;
    height: 35px;
    line-height: 35px;
    margin-top: 7px;
}

.sure_canvas {
    position: absolute;
    right: 10px;
    top: 0;
    padding: 0 20px;
    background: #20A53A;
    border-radius: 4px;
    color: #fff;
    height: 35px;
    line-height: 35px;
    margin-top: 7px;
}